The Democratic Party's campaign arms outperformed their Republican counterparts in January.

The Democratic Congressional Campaign Committee, the Democratic Party's House campaign arm, announced on Friday it had raised $6 million in January. The National Republican Congressional Committee, meanwhile, raised $4.8 million in January, an official told ABC News.

The $6 million haul was the DCCC's largest ever in January, according to a spokesman.

The Democratic Senatorial Campaign Committee took in $5 million in January, the organization announced, while the National Republican Senatorial Committee took in $4.19 million.

The Republican Party has a larger war chest for House races; for Senate races, the opposite is true.

An NRCC spokesman told ABC News the group ended January with $17.6 million in the bank, while the DCCC said it ended January with $13.05 million on hand. The DSCC, meanwhile, said it ended January with $15.4 million on hand, while the NRSC said it had $13.4 million in the bank.

In 2011, the DCCC managed to out-raise the NRCC by $2.8 million for the year, even as Republicans entered the House majority. The DCCC raised just under $50 million in 2011, while the NRCC raised just over $47 million.

After their sweeping gains in the 2010 midterm elections, Republicans will defend more vulnerable House  seats in 2012. Republicans will defend 19 House seats rated as "toss-ups" by the Cook Political Report in 2012, while Democrats will defend none.

In the Senate, however, Democrats have it much worse. Democrats will defend seven "toss-up" seats, according to Cook, while Republicans will defend two.